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The Curtiss/Curtiss-Robertson Model 56 Thrush〔All Curtiss model numbers lower than 75 were assigned retroactively.〕 was a 1929 six passenger high-wing fixed undercarriage single-engine cabin monoplane airliner and utility transport powered by either a Curtiss Challenger or a Wright Whirlwind radial engine〔 and built as an enlargement of the earlier Curtiss Robin.〔 ==Design and development== Three Curtiss Challenger-engined Curtiss Thrush prototypes (serialled G-1 to G-3) were built at Curtiss' Garden City factory, but these were underpowered〔 and production examples, redesignated Thrush J (serialled 1001 to 1010) with Wright Whirlwind engines, were built at the Curtiss-Robertson St Louis factory. All three prototypes were later re-engined with Whirlwinds to make them Thrush Js.〔Juptner, 1964, p.170〕 The fuselage of the Thrush formed the basis for the twin-engine Curtiss Kingbird developed roughly in parallel.〔Bowers, 1979, p.386〕 The fuselage was built up as a Pratt truss frame formed mainly from Duraluminum tubing and fittings with welded Chrome-moly tubing reinforcing highly stressed areas and covered in fabric.〔 The wing was a fabric covered semi-cantilever〔The inner portion of the wing was strut braced, while the outboard was cantilever.〕 braced with steel tube struts, and had solid spruce spars and stamped Alclad ribs with Alclad sheet wrapped over leading edge.〔 A fuel tank is mounted within each wing near the root.〔 Rudder and elevators were welded chrome-moly steel tubing.〔 116" track undercarriage is fitted with oleo-pneumatic shock obsorbers and Bendix brakes, and is braced to the front struts and lower longerons.〔 Aside from the engine, the prototypes differed in having a large lobe type aerodynamic counterbalance on the rudder that was faired in and squared off on the production versions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Curtiss Thrush」の詳細全文を読む スポンサード リンク
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